fix: [diagnostic] Catch connectionError exception

diagnostic.py

@@ -292,7 +292,7 @@ def check_buffer_change_rate(spinner):
             change_decrease = 0
 
         if time_slept >= sleep_max:
-            return_flag = elements_in_inlist_init < elements_in_list or elements_in_list == 0
+            return_flag = elements_in_list == 0 or (elements_in_list - elements_in_inlist_init < 3)
             return_text = f'Buffer is consumed {"faster" if return_flag else "slower" } than being populated'
             break
 
@@ -329,7 +329,7 @@ def check_dispatcher_status(spinner):
 \t➥ Consider restarting it: {pgrep_dispatcher_output}'''
                 break
             time.sleep(sleep_duration)
-            spinner.text = f'No response yet'
+            spinner.text = f'Dispatcher status: No response yet'
             time_slept += sleep_duration
         else:
             return_flag = True
@@ -343,10 +343,13 @@ def check_dispatcher_status(spinner):
 def check_server_listening(spinner):
     url = f'{HOST}:{PORT}/_get_log_head'
     spinner.text = f'Trying to connect to {url}'
-    r = requests.get(url)
+    try:
+        r = requests.get(url)
+    except requests.exceptions.ConnectionError:
+        return (False, f'Can\'t connect to {url}')
     return (
         r.status_code == 200,
-        f'Server is {"not " if r.status_code != 200 else ""}running. Status code [{r.status_code}]'
+        f'{url} {"not " if r.status_code != 200 else ""}reached. Status code [{r.status_code}]'
      )
 
 
@@ -390,8 +393,8 @@ def start_diagnostic():
     if check_buffer_queue() is not True:
         check_buffer_change_rate()
     check_dispatcher_status()
-    check_server_listening()
-    check_server_dynamic_enpoint()
+    if check_server_listening():
+        check_server_dynamic_enpoint()
 
 
 def main():